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首页> 外文期刊>Proceedings of the institution of civil engineers >Net load-displacement estimation in soil-nail pullout tests
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Net load-displacement estimation in soil-nail pullout tests

机译：土钉拉拔试验中的净载荷-位移估计

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摘要

Soil-nails are used to stabilise a soil mass by exploiting the resistance generated by the skin friction between the ground and grout and the tensile stiffness of the reinforcing material. A load-displacement curve is obtained from in situ pullout load tests performed by considering the elastic shear modulus and ultimate skin friction capacity between the soil and grout. This study determines the shear behaviour between the soils and grout analytically, especially the soil-dilation effect during shearing that is one of the main factors affecting the ultimate skin friction, even though this estimation is rather cumbersome. Many studies assume a full bond between the grout and the steel reinforcing bar, thus neglecting their relative displacement. In this study, the net load-displacement between the ground and grout is obtained by subtracting the nail elongation from the load-displacement of the pullout tests when estimating the shear displacement. Numerous field pullout tests are performed in this study under various ground conditions and through various construction methods. The dilatancy angles are estimated dependent on the soil type by comparing the net load-displacement curve obtained in the field with that obtained theoretically.
机译：土壤钉子用于通过利用地面与水泥浆之间的皮肤摩擦以及增强材料的拉伸刚度产生的阻力来稳定土壤质量。荷载-位移曲线是通过考虑土壤和水泥浆之间的弹性剪切模量和最终皮肤摩擦能力而进行的原位拉拔荷载试验得出的。这项研究分析性地确定了土壤和灌浆之间的剪切行为，特别是剪切过程中的土壤膨胀效应，这是影响最终皮肤摩擦的主要因素之一，尽管这一估算相当麻烦。许多研究假设灌浆和钢筋之间存在完全的结合，因此忽略了它们的相对位移。在这项研究中，在估算剪切位移时，通过从拔出试验的载荷位移中减去钉子的伸长率，可以获得地面与水泥浆之间的净载荷位移。在这项研究中，在各种地面条件和各种建造方法下进行了大量的现场拉拔试验。通过将现场获得的净载荷-位移曲线与理论上获得的净载荷-位移曲线进行比较，可以根据土壤类型估算出膨胀角。

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